Two birds with one stone: dual grain-boundary and interface passivation enables >22% efficient inverted methylammonium-free perovskite solar cells

Abstract

Advancing inverted (p-i-n) perovskite solar cells (PSCs) is key to further enhance the power conversion efficiency (PCE) and stability of flexible and perovskite-based tandem photovoltaics. Yet, the presence of defects...

Defect Healing in FAPb(I1‐xBrx)3 Perovskites: Multifunctional Fluorinated Sulfonate Surfactant Anchoring Enables >21% Modules with Improved Operation Stability

“…It would be caused by the nature of solution-processed polycrystalline perovskite film, where the perovskite surface and bulk grain boundaries are important sources for nonradiative recombination, which can heavily trapping photogenerated charge carriers and thus inhibiting the performance of the device. [37] Researchers have extensively used various techniques such as iodide management, [38,39] additive engineering, [40][41][42] composition engineering, [43,44] grain boundary /surface passivation, [45][46][47] and nonradiative recombination suppression [48,49] in the past few years to improve the quality of MA-free perovskite films. Studies to simultaneously fabricate uniform, high-quality, and large-area perovskite films with modulated crystallization orientation, annihilated defects, and improved device operation stability have rarely been conducted.…”

Methodologies for >30% Efficient Perovskite Solar Cells via Enhancement of Voltage and Fill Factor

“…2D and low-dimensional perovskites have been used as interface materials because of their multifunctional roles of defect passivation, energy band alignment, and moisture protection. [27,[108][109][110] In the past few years, the various large-sized organic ammonium cations containing a long alkyl chain (e.g., butyl group, hexyl group, octyl group, etc.) and aromatic ring (e.g., benzene, thiophene, etc.)…”

Gas‐Assisted Spray Coating of Perovskite Solar Cells Incorporating Sprayed Self‐Assembled Monolayers

“…[9,10] One material system of particular interest are self-assembled monolayers (SAMs) that comprise carbazole moieties and phosphonic acid tail groups, with such materials capable of creating practically lossless hole-transport interfaces. [11,12] SAMs, therefore, represent a simple and low-cost PSC technology, with state-of-the-art inverted devices demonstrating PCEs approaching 23% [13] and perovskite/Si tandems surpassing 29%. [14] To drive PSC technology toward commercialization, it is increasingly important to develop new perovskite and chargetransporting materials that combine high-performance, enhanced operational stability, low-cost and the ability to be deposited using scalable techniques.…”

“…[ 9,10 ] One material system of particular interest are self‐assembled monolayers (SAMs) that comprise carbazole moieties and phosphonic acid tail groups, with such materials capable of creating practically lossless hole‐transport interfaces. [ 11,12 ] SAMs, therefore, represent a simple and low‐cost PSC technology, with state‐of‐the‐art inverted devices demonstrating PCEs approaching 23% [ 13 ] and perovskite/Si tandems surpassing 29%. [ 14 ]…”